Terahertz Laser Combs in Graphene Field-Effect Transistors

Abstract

Electrically injected terahertz (THz) radiation sources are extremely appealing given their versatility and miniaturization potential, opening the venue for integrated-circuit THz technology. In this work, we show that coherent THz frequency combs in the range $0.5\mathrm{THz}<\omega /2\pi <10\mathrm{THz}$ can be generated making use of graphene plasmonics. Our setup consists of a graphene field-effect transistor with asymmetric boundary conditions, with the radiation originating from a plasmonic instability that can be controlled by direct current injection. We put forward a combined analytical and numerical analysis of the graphene plasma hydrodynamics, showing that the instability can be experimentally controlled by the applied gate voltage and the injected current. Our calculations indicate that the emitted THz comb exhibits appreciable temporal coherence ($g^{(1)}(\tau )>0.6$) and radiant emittance ($10^7\mathrm{W}{\mathrm{m}}^{-2}$). This makes our scheme an appealing candidate for a graphene-base THz laser source. Moreover, a mechanism for the instability amplification is advanced for the case of substrates with varying electric permitivitty, which allows to overcome eventual limitations associated with the experimental implementation.

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Cited by in corpus (6)

• Electrical Tuning of Terahertz Plasmonic Crystal Phases
• Hydrodynamical study of Terahertz emission in magnetized graphene field-effect transistors
• Nonlinear density waves on graphene electron fluids
• THz detection and amplification using plasmonic Field Effect Transistors driven by DC drain currents
• Nonlocal electrodynamics of two-dimensional anisotropic magneto-plasmons
• TeraFET terahertz detectors with spatially non-uniform gate capacitances